Senior Blockchain Developer — United States

Company Description

QDbCF WtDj is a stealth AI x Web3 company building the infrastructure for autonomous agents to operate safely in regulated real-world asset markets — starting with real estate. We combine AI decision-making, blockchain trust, and legal compliance to enable a new class of intelligent, on-chain ownership.

We are pre-seed, backed by angels and VCs, and building our MVP with a small, remote-first team. We believe in outcomes over hours, async by default, and equity for every full-time hire. Our work sits at the frontier of AI, Web3, and legal-tech — and we’re solving problems that don’t have playbooks yet.

If you want high ownership, hard problems, and the chance to shape a new category from the ground up, Persona is the place to do it.

Role Description

As a Senior Blockchain Engineer at QDbCF WtDj, you will be responsible for designing, implementing, and maintaining blockchain-based systems, with a focus on the EVM ecosystem. You’ll work closely with our product and engineering teams to build secure, scalable, and efficient smart contracts and on-chain infrastructure that support real-world asset tokenization, programmable payments, and AI-driven financial operations.

Key Responsibilities

• Design and develop smart contracts and blockchain-based applications.

• Build and maintain on-chain infrastructure and integrations.

• Work on tokenization logic, asset management, and payment flows.

• Collaborate with product and engineering teams to define technical architecture.

• Ensure security, performance, and reliability of blockchain systems.

• Participate in code reviews, testing, and deployment processes.

Requirements

• 3+ years of experience in blockchain development, preferably on EVM-compatible chain.

• Strong proficiency in Solidity and smart contract development.

• Experience with Web3 libraries, wallets, and decentralized applications.

• Understanding of token standards (SPL, fungible and non-fungible tokens).

• Solid problem-solving skills and ability to work in a fast-paced environment.

• Good communication skills and a team-oriented mindset.

Nice to Have

• Experience with zero-knowledge proofs, cross-chain protocols, or DeFi.

• Background in financial systems, tokenization, or real-world asset platforms.

• Open source contributions or active presence in the EVM-compatible blockchain ecosystem.